129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
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/*
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* regerror - error-code expansion
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*
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* Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
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*
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* Development of this software was funded, in part, by Cray Research Inc.,
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* UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics
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* Corporation, none of whom are responsible for the results. The author
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* thanks all of them.
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*
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* Redistribution and use in source and binary forms -- with or without
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* modification -- are permitted for any purpose, provided that
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* redistributions in source form retain this entire copyright notice and
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* indicate the origin and nature of any modifications.
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*
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* I'd appreciate being given credit for this package in the documentation of
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* software which uses it, but that is not a requirement.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "regguts.h"
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/*
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* Unknown-error explanation.
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*/
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static const char unk[] = "*** unknown regex error code 0x%x ***";
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/*
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* Struct to map among codes, code names, and explanations.
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*/
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static const struct rerr {
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int code;
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const char *name;
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const char *explain;
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} rerrs[] = {
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/* The actual table is built from regex.h */
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#include "regerrs.h"
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{ -1, "", "oops" }, /* explanation special-cased in code */
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};
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/*
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- regerror - the interface to error numbers
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*/
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/* ARGSUSED */
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size_t /* Actual space needed (including NUL) */
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regerror(
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int code, /* Error code, or REG_ATOI or REG_ITOA */
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char *errbuf, /* Result buffer (unless errbuf_size==0) */
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size_t errbuf_size) /* Available space in errbuf, can be 0 */
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{
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const struct rerr *r;
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const char *msg;
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char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */
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size_t len;
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int icode;
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switch (code) {
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case REG_ATOI: /* Convert name to number */
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for (r = rerrs; r->code >= 0; r++) {
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if (strcmp(r->name, errbuf) == 0) {
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break;
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}
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}
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sprintf(convbuf, "%d", r->code); /* -1 for unknown */
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msg = convbuf;
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break;
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case REG_ITOA: /* Convert number to name */
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icode = atoi(errbuf); /* Not our problem if this fails */
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for (r = rerrs; r->code >= 0; r++) {
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if (r->code == icode) {
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break;
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}
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}
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if (r->code >= 0) {
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msg = r->name;
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} else { /* Unknown; tell him the number */
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sprintf(convbuf, "REG_%u", (unsigned)icode);
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msg = convbuf;
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}
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break;
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default: /* A real, normal error code */
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for (r = rerrs; r->code >= 0; r++) {
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if (r->code == code) {
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break;
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}
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}
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if (r->code >= 0) {
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msg = r->explain;
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} else { /* Unknown; say so */
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sprintf(convbuf, unk, code);
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msg = convbuf;
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}
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break;
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}
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len = strlen(msg) + 1; /* Space needed, including NUL */
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if (errbuf_size > 0) {
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if (errbuf_size > len) {
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strcpy(errbuf, msg);
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} else { /* Truncate to fit */
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strncpy(errbuf, msg, errbuf_size-1);
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errbuf[errbuf_size-1] = '\0';
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}
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}
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return len;
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}
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* fill-column: 78
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* End:
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*/
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